Vat dyestuff and process of making same



I Patented Oct. 20, 1925.

a citizen of the United'States, anda resivented a certain new and useful Vat Dye-' having the formula;

; furic ac'idor other inert solvent.

-UNITED sures PATENT OFFICE.

:rosnrn G. nmw nnxn, or rnNns-enovn, new JnnsEY, .assrenon 'ro E. I. no Pom nn NEMOUBS & COMYANY, F WILMINGTON, DELAWARE, A CORPORATION OF DELA- VAT DYES'IUFF AND IPBOCESS 0F MAKING SAME.

1% Drawing. Application filed'Januaiy 8, 1925. Serial No. 1,158.

To all who-m iii may concern: 7

Be it known that I, JOSEPH G. Dmwinnin, product) until a clear red brown solution is dent of Penns Grove, in the county of Salem and State of New Jersey, have insolution, in an inert solvent such as benzene,

1 of the niolecularly equivalent amount of 2- stufi' and Process of Making Same, of which hydroxy-il niethyl chloro-thi'onaphthene. the following is a specification. When suflicient time, say half'an hour, has This invention 'relatesto the production elapsed to insure that the reaction is comof a violet vat dyestufi by the condensation pleted, the dyestuif is filtered off, washed of a di-halo-isatin-chloride with an hywith a solvent such as benzene, then with droxy-methyl-halo-thionaphthene, and pan alcohol and finally dried inan oven at 50 ticularly of dibromisatimchloride with 2- hydroxy-3-methyl 5 ehloro-thionaphthene,

in vthe'form of powder or may be made into xi u CH3 H dyestuff dyes cotton from a yellow orange of very good fastness to light, washing, chlorine, etc.'. I i The temperature at which the reaction between the dibromisatin and the thionaph- German Patent No. 193,150 describes a thene derivative is carried on is, within violet 'dyestuil produced by condensing wide limits, immaterial. The dyestufi has isatin chloride with EZ-hydrOXy-thionaphbeen 'made with the benzene solution of 2- thene and subsequently brominating this hydroxy-3-methyl-fi chloro-thionaphthene at condensation product innitrobenzene, sulroom temperature, (3., and the dibromisatin chloride solution in chlor-benzene By the process described below a new varying from room temperatureto the boildye is obtained, which has properties superior to that described in German Patent No. I 193,150 in regard to brightness, shade and tinctgrial l phosphorous pentachloride, hydrochloric My invention may be illustrated bythe acid is split oil as is also the case during following specific example: the condensation of the dibromisatin-chlo- Heat under reflux with mono-chlorobem, ride with 2-hydroxy-3-methyl-5-chlorozene or another suitable inert solvent 10.35 thionaphthene. parts of dibr'omisatin together with a slight The reactions which occur are probably excess of phosphorus pentachloride (for exas follows:

In the condensation of dibromisatinwith Dibromlsntln +-1jhoephonm Dlbromlsatln chloride .Pentachloride +P0 Ola Dibromhatin chloride 2-hydroly-i-methylmomthlolephthan.

a paste for greater ease in dissolving. Said ample, with 8.52 parts of the commercial 40' obtained,- This solution is mixed with good stirring for at least fiveminutes with a (30 C. The dyestulf in powder form has i a brilliant redrhluevshade; it may be used hydrosulfite vat a brightfull shade oflviolet ing point of monorchlor-benzene, which is Although in the above example certain specific conditions of operation have been mentioned, it will be understood that my invention is not limited thereto, but that the process may .be modifiedin' various ways without'departin from the spirit or scope of my invention.

The new dyestuffs above described are chiefly useful in the dyeing of cotton, but they may also be used to advantage in the dyeing of wooland silk.

" I claim:

1. The process of producing a vat dyestuff which comprisescondensing a halois obtained, mixing-this solution, while stirgenated isatin-chloride with one molecularly-equivalent amount of an hydroxymethyhhaloethionaphthene.

2. The process of producing a vat dyestuff which comprises condensing a halogenated isatin chloricle with one molecularly-equivalent amount of 2-hydroxy-3-methyl-5-chloro- I thionaphthene.

3. The process of producin a vat dyestuff which comprises mixing a solution of dibromisatin-chloride in an inert solvent while stirring, with a solution .in. an inert solvent of 2 hydroxy-3-Inethyl-5-chloro-thionaphthene, and filtering and drying the precipitate formed. v

4. The process which comprises heating 10.35 parts of dibromisatin dissolved in an inert solvent under ,a reflux condenser with about eight parts of phosphorus pentachloride until a clear red-brown solution ring, with a solution of 2-hydro1iy-3aneth l- 5-chloro-thionaphthene, and recovering tie precipitate.

' 5. As a new composition of matter, a

,product obtainable by condensing a dib'romisatin-chloride with 2-hydroxy-fiemethyl-5- chloro thionaphthene, said product having, in powder form, a brilliant red-blue shade, and dyeing cotton fiber from a elloworange hydrosulfite vata bright full shade of violet of excellent fastness to light, washing,,and chlorine. i.

6. As a new composition of matter, a product obtainable by condensing a dibromisatin-chloride with 2-hydroXy-3-methyl-5- chloro-thionaphthene, and having most probably the following graphical formula zature. 

